1 //===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the SmallVector class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/SmallVector.h"
17 // Check that no bytes are wasted and everything is well-aligned.
26 static_assert(sizeof(SmallVector<void *, 0>) ==
27 sizeof(unsigned) * 2 + sizeof(void *),
28 "wasted space in SmallVector size 0");
29 static_assert(alignof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
30 "wrong alignment for 16-byte aligned T");
31 static_assert(alignof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
32 "wrong alignment for 32-byte aligned T");
33 static_assert(sizeof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
34 "missing padding for 16-byte aligned T");
35 static_assert(sizeof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
36 "missing padding for 32-byte aligned T");
37 static_assert(sizeof(SmallVector<void *, 1>) ==
38 sizeof(unsigned) * 2 + sizeof(void *) * 2,
39 "wasted space in SmallVector size 1");
41 /// grow_pod - This is an implementation of the grow() method which only works
42 /// on POD-like datatypes and is out of line to reduce code duplication.
43 void SmallVectorBase::grow_pod(void *FirstEl, size_t MinCapacity,
45 // Ensure we can fit the new capacity in 32 bits.
46 if (MinCapacity > UINT32_MAX)
47 report_bad_alloc_error("SmallVector capacity overflow during allocation");
49 size_t NewCapacity = 2 * capacity() + 1; // Always grow.
51 std::min(std::max(NewCapacity, MinCapacity), size_t(UINT32_MAX));
54 if (BeginX == FirstEl) {
55 NewElts = safe_malloc(NewCapacity * TSize);
57 // Copy the elements over. No need to run dtors on PODs.
58 memcpy(NewElts, this->BeginX, size() * TSize);
60 // If this wasn't grown from the inline copy, grow the allocated space.
61 NewElts = safe_realloc(this->BeginX, NewCapacity * TSize);
64 this->BeginX = NewElts;
65 this->Capacity = NewCapacity;